The fuel pump located in a tank provides fuel supply through the filter (mounted on the bulkhead of the engine compartment) into a constant pressure distributor. Stabilization of fuel pressure at the outlet of the distributor is provided by a pressure regulator.
The fuel injection system consists of a control unit and the following sensors:
- throttle angle sensor;
- coolant temperature sensor;
- flow rate meter;
- crankshaft rotation sensor;
- vehicle speed sensor;
- power steering pressure sensor;
- exhaust sensor.
The processor control unit compares the incoming information and generates signals that control the injectors, mixture composition and ignition timing.
Automatic stabilization of idling is provided by a bypass air valve controlled from the processor unit.
The throttle body has an automatic cold idle boost system, which is controlled by a thermostatic valve. As the engine warms up, the valve body expands, moving the valve plunger, which in turn acts on the throttle shaft cam, thereby closing the throttle.
The injection system also has a solenoid valve for correcting idle speed when the engine load increases (for example, when turning on the hydraulic booster or air conditioner).
Attention! On some vehicles, this valve is installed without connection (dormant). On vehicles with a converter, the processor unit also controls the emission control systems.
The control unit has a function "failure protection", which, in the event of a failure of one of the sensors, ensures the transfer of control to the backup simulating circuit, which allows you to continue moving, albeit with degraded operational parameters. In this case, the control lamp lights up on the instrument panel, and the malfunction is encoded and stored in the memory of the control unit.
When the warning lamp lights up, the car should be handed over to the dealer's car service.
Attention! The control unit has a self-diagnosis function that provides independent reading of failure codes.